//双向链表
#ifndef __NA__
#define __NA__

#include <myhead.h>
typedef struct node
{
	union
	{
		int len;
		int date;
	};
	struct node *pro;
	struct node *next;
}liink,*Pliink;

Pliink creat_double();
int front_insert(Pliink,int);
int rear_insert(Pliink,int);
int anypos_insert(Pliink,int,int);
int anypos_delete(Pliink,int);
int link_destroy(Pliink);
int output_link(Pliink);
#endif
